Subclipse / SVN Working copy locked - Solution

Problem

I could not update or commit a certain folder in my subversion project using subclipse in eclipse.

Symptoms

Both commit and update failed with the error:

svn: Working copy 'path/to/folder/that/was/not/working' locked; try performing 'cleanup'

I also got warnings that the directory was not under version control.

To get this problem, I had copied files from one project to another (in the file system not in subclipse). Although I deleted the .svn directory after copying, I still ran into this issue.

Solution

On the command line, cd to the project directory and run svn cleanup as in:

cd path/to/folder/that/was/not/working
svn cleanup

The problem should go away!